CN113003543B - Rapid ignition method of fluidized bed furnace for preparing sulfuric acid - Google Patents
Rapid ignition method of fluidized bed furnace for preparing sulfuric acid Download PDFInfo
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- CN113003543B CN113003543B CN202110452480.5A CN202110452480A CN113003543B CN 113003543 B CN113003543 B CN 113003543B CN 202110452480 A CN202110452480 A CN 202110452480A CN 113003543 B CN113003543 B CN 113003543B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/74—Preparation
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Abstract
The invention discloses a rapid ignition method of a fluidized bed furnace for preparing sulfuric acid, belonging to the technical field of sulfuric acid preparation. The method comprises the following steps: (1) Cleaning the fluidized bed furnace after stopping, and cleaning the lower layer furnace slag obtained by cleaning for later use; (2) mixing sulfur with lower layer furnace cleaning slag according to a mass ratio of 1:4-6, adding the mixture into a fluidized bed furnace after uniformly mixing, and igniting the mixture through an oil gun; (3) When the temperature of the furnace bottom reaches 220-240 ℃, extinguishing the oil gun, adding sulfur and controlling the oxygen concentration and sulfur dioxide sulfur concentration; (4) When the temperature of the furnace bottom reaches 470-490 ℃, stopping adding sulfur and adding pyrite. The special slag is used with sulfur, the slag is suitable in size and moisture, the ignition speed of sulfur can be controlled, no dust is generated basically during use, the generation speed and concentration of sulfur dioxide can be controlled during use with sulfur, the process is simple, ignition of the fluidized bed furnace can be realized at a lower temperature, and meanwhile, scarring can not occur during ignition.
Description
Technical Field
The invention belongs to the technical field of sulfuric acid preparation, and particularly relates to a rapid ignition method of a fluidized bed furnace for preparing sulfuric acid.
Background
The original point fire mode of the sulfuric acid plant is that the drying mine is Chai Youqiang for ignition, the ignition mine is also required to be dried by fire slag, dust in the drying process is larger, ash is generated when the mine is paved in the furnace, the environment is protected, the ignition time is about 16-18 hours, high-temperature explosion and easy scarring can occur in the later stage of ignition, the diesel oil consumes about 5 tons, the diesel oil is used for raising the furnace temperature and is wasted, the system is also influenced, the environment-friendly data has the phenomenon of exceeding standard emission, the conversion section has the electric furnace protection conversion temperature due to the long ignition time, the electric energy consumption is increased, a group of electric furnaces is 100KW, the total capacity is 1800KW, the electric consumption is 27000 ℃ when the total capacity is 15 hours, and the additional system loading is required for two days.
In the prior art, although ignition is performed by other modes, as disclosed in patent application number CN201610762580.7, an energy-saving and environment-friendly method for igniting an acid-making fluidized bed furnace by pyrite comprises the following steps:
(1) preparing a tool: preparing ignition tools, ignition materials and refractory bricks and refractory clay for sealing a furnace door hole of the fluidized bed furnace;
(2) inspection system and fluidized bed furnace: checking to ensure that all post equipment, electric instruments and valves of the sulfuric acid system are in a normal state, checking and cleaning the fluidized bed furnace to be in a normal state, and ensuring that the whole has starting ignition conditions;
(3) cold boiling experiments: starting a furnace front fan to perform a cold boiling experiment and recording bottom pressure, fan frequency, valve opening and fan current;
(4) paving ore: uniformly mixing granular sulfur and red slag in proportion, adding the mixture into a fluidized bed furnace, carrying out trimming after blowing out high wind, and adding pyrite into a raw material warehouse;
(5) and (3) ignition: igniting a flame, igniting an oil gun and sulfur in the furnace, gradually increasing the air quantity, closing the oil gun when the middle and upper layers in the furnace rise to the temperature A, and adding sulfur into the fluidized bed furnace;
(6) when the fire behavior in the furnace is increased and boiling is better and the bottom and middle layers are risen to the temperature B, the furnace door is sealed by a fire clay, the blast amount and the sulfur amount of the feed are gradually increased, and the electric demister is started;
(7) when the temperature of the fixed layer in the furnace rises to the temperature C, adding a layer of sulfur-paved pyrite on the surface, and when the temperature of the fixed layer rises to the temperature D, stopping adding sulfur and only adding the sulfur-paved pyrite, observing the boiling state in the furnace and the temperature condition of the bottom layer, and timely adjusting the air quantity and the ore feeding quantity;
(8) and (3) adjusting the ore feeding amount and the air quantity according to the condition in the furnace, and switching to normal when the temperature of the furnace bottom exceeds the temperature E, so that the ignition is successful.
It still has the following problems:
(1) The dust is large, and the electric dust removal and electric defogging are usually needed to be started, but even if the equipment is started, the discharged gas exceeds the standard (the concentration of the dust in the tail gas is more than 300 mg/m) 3 ) It is difficult to meet the environmental protection requirement;
(2) Red slag is needed, and is usually dried and crushed to a certain size for use, so that time and labor are wasted;
(3) The process is complex, the requirement on operators is high, and five temperature control points are provided;
(4) The temperature of the temperature node is higher, the operation is not easy, the emission of sulfur dioxide is not easy to control, the pyrite is added at the higher temperature, and the sulfur is required to be added on the surface of the pyrite when the pyrite starts to be added.
Disclosure of Invention
In order to solve the problems, the embodiment of the invention provides a rapid ignition method of a fluidized bed furnace for preparing sulfuric acid, which adopts special slag to be matched with sulfur, the slag is suitable in size and moisture, the ignition speed of the sulfur can be controlled, no dust is generated basically during use, the generation speed and concentration of sulfur dioxide can be controlled during use, the process is simple, the ignition of the fluidized bed furnace can be realized at a lower temperature, and meanwhile, the scab can not occur during ignition. The technical scheme is as follows:
the embodiment of the invention provides a rapid ignition method of a fluidized bed furnace for preparing sulfuric acid, which comprises the following steps:
(1) The fluidized bed furnace after stopping is cleaned, the lower layer furnace cleaning slag (the amount is generally larger than that for ignition) obtained by cleaning is reserved, and the lower layer furnace cleaning slag does not need drying and crushing treatment;
(2) Sulfur (particles with normal size and no requirement on particle size) and lower layer furnace cleaning slag are mixed according to the mass ratio of 1:4-6, adding the mixture into a fluidized bed furnace after uniformly mixing, and igniting the mixture through an oil gun;
(3) When the temperature of the furnace bottom reaches 220-240 ℃, extinguishing the oil gun, adding sulfur and controlling the oxygen concentration and sulfur dioxide sulfur concentration;
(4) When the temperature of the furnace bottom reaches 470-490 ℃, stopping adding sulfur (namely realizing ignition), and adding pyrite (according to the conventional ore adding flow).
In the step (1), the lower layer slag is the part below 1/3 thickness (from bottom to top) of the slag during furnace cleaning, and the upper layer slag (with smaller grain size) is not used in the ignition process during furnace cleaning.
In the step (1), the furnace cleaning period is 1.0-2.5 years (normal period), and the furnace can be stopped under special conditions, such as fault maintenance of other equipment, no order and the like.
Wherein, the boiling furnace with annual yield of 20 ten thousand tons is used; in the step (2), the addition amount of sulfur is 3-4 tons; in the step (3), the addition amount of sulfur is 5-6 tons.
Wherein in the step (2), the temperature rise time is 50-60 minutes to 220-240 ℃.
In the step (2), the fan is adopted for paving the ores, so that the ores can be paved automatically, and the labor is reduced.
Wherein in the step (3), the concentration (mass concentration) of sulfur dioxide is controlled to be less than 6% (usually 4-5%) and the concentration (mass concentration) of oxygen is controlled to be 13-15%.
Wherein in the step (3), the temperature rise time is 100-120 minutes to 470-490 ℃.
In the step (4), the temperature of the furnace bottom is controlled to be less than or equal to 900 ℃, and the temperature is controlled to be slightly wider than that in the prior art.
Specifically, the embodiment of the invention provides a rapid ignition method of a fluidized bed furnace for preparing sulfuric acid, which comprises the following steps:
(1) Cleaning the fluidized bed furnace after stopping, and cleaning the lower layer furnace slag obtained by cleaning for later use; wherein, the lower layer slag is a part with the thickness of less than 1/3 of the slag during furnace cleaning.
(2) Sulfur and lower layer furnace cleaning slag are mixed according to the mass ratio of 1:4-6, and igniting the mixture by an oil gun, wherein the addition amount of sulfur is 3-4 tons (counted by the fluidized bed furnace producing 20 ten thousand tons per year), and the heating time is 50-60 minutes.
(3) When the temperature of the furnace bottom reaches 220-240 ℃, the oil gun is extinguished, sulfur is added, the addition amount of the sulfur is 5-6 tons (counted by a boiling furnace with annual production of 20 ten thousand tons), the heating time is 100-120 minutes, the concentration of sulfur dioxide is controlled to be less than 6%, and the concentration of oxygen is controlled to be 13-15%.
(4) When the temperature of the furnace bottom reaches 470-490 ℃, stopping adding sulfur and adding pyrite.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
(1) The red slag is not needed, and special slag is adopted.
(2) The ignition process basically generates no dust, and the automatic ore paving can be realized by using a fan, so that the environment is protected, and the labor is saved.
(3) The process is simple, only four steps and three temperature control points are adopted, and the operation is convenient.
(4) During ignition, electric defogging and electric dust removal are not needed, the tail gas emission meets the environmental protection standard, and the concentration of dust in the tail gas is always less than 150mg/m 3 The concentration of sulfur dioxide is less than 200ppm.
(5) The ignition does not have a temperature swelling period, and can not be scarred due to the swelling period.
(6) The whole ignition process only needs less than three hours, diesel only needs about 0.5 ton, combusted sulfur produces acid, and a large amount of electric energy consumption is saved, the system is fully charged from ignition, one shift can be completed, the time from the whole ignition to normal driving is greatly shortened, the efficiency is improved, and the consumption of manpower, financial resources and material resources is greatly reduced.
In a word, the process of the invention has the advantages of environmental protection, energy saving, economy, rapidness and the like.
Drawings
FIG. 1 is a flow chart of a method for rapid ignition of a fluidized bed furnace for producing sulfuric acid, which is provided by an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
Referring to fig. 1, an embodiment of the present invention provides a method for rapidly igniting a fluidized bed furnace for producing sulfuric acid, which comprises:
(1) Furnace cleaning: and cleaning the fluidized bed furnace after stopping, and cleaning the lower layer furnace slag obtained by cleaning the furnace for later use.
(2) Igniting sulfur and slag: mixing the lower layer furnace cleaning slag of 4t and 20t of sulfur uniformly, adding the mixture into a fluidized bed furnace, igniting the mixture through an oil gun, and heating the mixture for 50 minutes until the temperature reaches 230 ℃.
(3) Igniting sulfur: when the temperature of the furnace bottom reaches 230-240 ℃, extinguishing the oil gun, adding sulfur for 5t, heating for 60-120 minutes until the temperature reaches 470-480 ℃, controlling the concentration of sulfur dioxide to be less than 6%, and controlling the concentration of oxygen to be 13-15%.
(4) Adding pyrite: when the temperature of the furnace bottom reaches 470-480 ℃, stopping adding sulfur and adding pyrite.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (4)
1. A method for rapid ignition of a fluidized bed furnace for producing sulfuric acid, the method comprising:
(1) Cleaning the fluidized bed furnace after stopping, wherein the lower layer of cleaning slag obtained by cleaning is a part with the thickness of less than 1/3 of the slag during cleaning;
(2) Sulfur and lower layer furnace cleaning slag are mixed according to the mass ratio of 1:4-6, adding the mixture into a fluidized bed furnace after uniformly mixing, igniting the mixture through an oil gun, wherein the addition amount of sulfur is 3-4 tons, and the heating time is 50-60 minutes;
(3) When the temperature of the furnace bottom reaches 220-240 ℃, extinguishing the oil gun, adding sulfur with the addition amount of 5-6 tons, heating for 100-120 minutes, controlling the concentration of sulfur dioxide to be less than 6%, and controlling the concentration of oxygen to be 13-15%;
(4) When the temperature of the furnace bottom reaches 470-490 ℃, stopping adding sulfur and adding pyrite.
2. The method for rapid ignition of a fluidized bed furnace for producing sulfuric acid according to claim 1, wherein in the step (1), the cleaning cycle is 1.0 to 2.5 years.
3. The method for rapid ignition of a fluidized bed furnace for producing sulfuric acid according to claim 1, wherein in the step (2), a fan is used for ore paving.
4. The method for rapid ignition of a fluidized bed furnace for producing sulfuric acid according to claim 1, wherein in the step (4), the temperature of the furnace bottom is controlled to be 900 ℃ or less.
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| CN1412106A (en) * | 2001-10-19 | 2003-04-23 | 四川宏达(集团)有限公司 | Equipment for making acid by using pyrite (sand) and method for making acid by means of full combustion of solid sulfur |
| CN101362590A (en) * | 2007-08-07 | 2009-02-11 | 江西铜业集团公司 | Temperature-rising method of fluidized bed furnace for pyrite-based sulphuric acid |
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| CN104787731A (en) * | 2014-12-10 | 2015-07-22 | 湖北新洋丰肥业股份有限公司 | No-pollution starting-up method for acid preparation from sulfur concentrate |
| CN106379866A (en) * | 2016-08-30 | 2017-02-08 | 襄阳泽东化工集团有限公司 | Energy-saving eco-friendly ignition method of pyrite-based acid making fluidized bed furnace |
| CN109704293A (en) * | 2018-12-19 | 2019-05-03 | 云浮联发化工有限公司 | A kind of roasting method relieving haperacidity fluidized bed furnace ignition method |
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2021
- 2021-04-26 CN CN202110452480.5A patent/CN113003543B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1412106A (en) * | 2001-10-19 | 2003-04-23 | 四川宏达(集团)有限公司 | Equipment for making acid by using pyrite (sand) and method for making acid by means of full combustion of solid sulfur |
| CN101362590A (en) * | 2007-08-07 | 2009-02-11 | 江西铜业集团公司 | Temperature-rising method of fluidized bed furnace for pyrite-based sulphuric acid |
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| CN106379866A (en) * | 2016-08-30 | 2017-02-08 | 襄阳泽东化工集团有限公司 | Energy-saving eco-friendly ignition method of pyrite-based acid making fluidized bed furnace |
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